VMAF v1: 好还远远不够

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Netflix TechBlog

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Learn about Netflix’s world class engineering efforts, company culture, product developments and more.

了解Netflix世界一流的工程实践、企业文化、产品开发及更多资讯。

By Christos G. Bampis, Zhi Li, Kyle Swanson, Nil Fons Miret and Pavan Madhusudanarao

作者：Christos G. Bampis，Zhi Li，Kyle Swanson，Nil Fons Miret 和 Pavan Madhusudanarao

Will this encode look good to Netflix members? Does switching to a new codec improve quality at the same bitrate and by how much? What is the best way to encode a movie title given a target bitrate budget? For years, VMAF has reliably helped us answer those questions and deliver an optimized quality of experience to our members.

这种编码在 Netflix 会员看来效果好吗？在相同码率下切换到新 codec 能否提升质量，提升多少？在给定目标码率预算的情况下，编码一部电影的最佳方法是什么？多年来，VMAF 一直可靠地帮助我们回答这些问题，并为会员提供优化的体验质量。

But good is not good enough. If VMAF misjudges quality, that may lead to loss of detail for a suspenseful close-up or banding for a stunning wide-angle sky shot. That’s a lot of trust to put in one number, so we strive to make sure it earns it. Over time, we collected feedback from VMAF users, both internally and externally. A few years ago, we embarked on a journey to develop a new version of VMAF to address some of its known limitations. Today, we are happy to announce that we are open-sourcing a new version of VMAF, with version number v1. By using VMAF v1 we can more accurately assess visual quality and hence efficiently deliver higher quality for Netflix members worldwide. In this po...